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boycey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote boycey Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2008 at 5:23pm
mr optimum balance first came to the attention of this forum in this thread.

his barrage of useless insults is actually better than his barrage of useless jargon- at least it's clear what a muppet he is there.

boyd was funnier. ToXiC had his moments. what's OB got?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote norty303 Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2008 at 5:50pm
The option of using series-parallel wiring is an interesting one.
 
In the past we've (collectively) come to the opionion that its ok for driving large numbers of speakers from an amp, say in a bar/corporate environment for speech etc, but not for driving bass in large scale application, partly because of loss of DF, but also because of the complications of changing wiring schemes without any significant benefit.  As the original poster has enough amps, he can achieve equal power using regular parallel wiring.
 
E.g.
Cab wired in series is 16R, in parallel with another cab is 8R.  Bridged 707 gives 1650 at 4R bridge meaning 825w per cab
 
Cab wired in parallel 4R, in series with another cab is 8R.  See above.
 
Cab wired in parallel 4R, 1 on each side of the 707 is 825w.  No wiring changes or complicated stuff to do.
 
 
Care to elaborate why you feel this is a good option?


Edited by norty303 - 08 October 2008 at 5:51pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jake_Fielder Quote  Post ReplyReply Direct Link To This Post Posted: 08 October 2008 at 7:40pm
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sKs01 Quote  Post ReplyReply Direct Link To This Post Posted: 10 October 2008 at 3:28am
oh dear lets not do this again its as much of a waste of time as class d on freespeakerplans. 2 amps 4r a side easy, job done. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote MisterBump Quote  Post ReplyReply Direct Link To This Post Posted: 17 October 2008 at 9:04pm
Originally posted by 2x18 2x18 wrote:

ok  how would you wire  4 cabs 2x 18" in each with 2 amps ?

2 x sr707s        825w into 2x 18" (4 ohm cab) per channel -  and lose input signal from active crossover

or

2 x sr707s        each bridged into 2 cabs in series (2 cabs would be 8 ohm ) - and not lose  input signal from active crossover

cannot run 707s at 2 ohms

thanks


user 2x18 must be even more confused after the hilarity of this thread!

If you've not been scared away from this forum forever 2x18, here's some simple advice without the over-technical nonsense.

825w per channel seems quite low for running two 18"s regardless of the load. I would definately give your drivers slightly more watts than they need (which will mean investing in more powerful amps) and restrict the signal db at your crossover to account for the extra power. Although the tolerances of the system will become more sensitive, you will get a better response overall. Your current amps will be working very hard with this setup and will probably protect/overheat quite rapidly should you want to run it hard.
To help your query, if you're dead set on this setup, switch your amps to parrallel and run one cab off each channel. If you have the option, use the link output of your first amp to send a signal to your second amp. You will then be sending a matching mono bass signal to each cab.

Although, as norty303 pointed out, running bass using this (parallel) method isn't ideal for large applications, I feel it will be more than adequate in your case and makes more sense than running your bass in stereo.

MB
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